求翻译（中译英）

In recent years, as with a diesel common rail systems, diesel-powered vehicles more powerful, cheaper fuel, diesel engines in automobiles has been used widely. However, diesel exhaust emissions, especially nitrogen oxides and particulate matter emissions is much larger than gasoline vehicles, serious pollution of the environment we live in, with the increasingly stringent emission requirements of national standard, how to reduce diesel vehicle emissions of pollutants into a big problem.
Raw materials and the engine due to fuel their own limitations, to purify the exhaust gas through the machine is very difficult, so, SCR exhaust gas aftertreatment system is born. The system used a certain amount of high-pressure injection of the catalyst (urea solution) and the SCR catalytic converters in automobile exhaust in chemical and physical reactions, to reduce the role of nitrogen oxide emissions.
SCR is currently the main post-processing techniques used in large-scale displacement of 2.5 liters or greater than the heavy-duty vehicles. Post-processing using the SCR technology, enables the European Ⅵ Ⅵ diesel vehicles meet emission standards in Europe. And compared to other European Ⅵ application technology, which can save fuel by 5% -10%. Played an energy saving purposes.

In recent years, due to equipped with diesel common rail diesel power system, more powerful, more province oil consumption, diesel engine has been used increasingly in the car. But diesel emission, especially nitrogen oxides and particulates emissions is more than gasoline vehicles, causing serious pollution of the environment we live in, with the gb standard request strictly on emissions, how to reduce diesel car exhaust the discharge of pollutants is a big problem. Because fuel materials and limitation of the engine, want to pass inside machine purify exhaust very difficult, therefore, SCR exhaust gas aftertreatment systems was born. The system mainly using a certain amount of high-pressure jet catalyst (urea aqueous) and automobile exhaust in SCR in TWC happen chemical and physical reaction to reduce emissions of nitrogen oxides role. Currently SCR after-treatment technology is mainly applied in emissions exceeded 2.5 litres of large or heavy cart. Use SCR after-treatment technology, can make Ⅵ engages the uefa euro Ⅵ discharge standards. With other European Ⅵ application technology compared, can save fuel 5% ~ 10%. Played an energy-saving purpose.

In recent years, with a system of diesel fuel, the stronger, more to save power, fuel engines in the application of increasing diesel oil. but the 尾气 discharge, and especially 氮氧化物 and particulate matter will be much more gas emissions. serious pollution in our living environment, with the requirements of the emission 国标 is strict, reducing diesel car 尾气 release pollutants into a big problem.
Owing to fuel the engine itself raw materials and restrictions, the purification 尾气 very difficult, therefore, scr 尾气 after processing systems was born. the system of a major catalyst of a jet of water solution （ urea ） 尾气 scr with the car in the act within the chemical and physical reactions, to reduce emissions of 氮氧化物.
At present, scr after processing applications than 2.5 排量 major in a large or a heavy wagon. the use of scr after processing, the euro Ⅵ diesel car reached the emission standards. the european Ⅵ with other european Ⅵ application of technology to save fuel 5% ~ 10%. on the purpose of the energy

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